Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer thinks too much air is going into the engine when it's just sitting still and not moving.
The P1263 code is triggered when the engine control module (ECM) detects a higher than expected mass or volume of air entering the engine at idle for Bank 2.
The Mass Air Flow (MAF) sensor measures the amount of air entering the engine. If the sensor detects an air flow rate that exceeds the expected threshold for an idling engine on Bank 2, the ECM will set the P1263 code. This can indicate a problem with the MAF sensor, a vacuum leak, or other issues affecting air intake.
• Check Engine Light is on
• Rough idle
• Poor fuel economy
• Faulty Mass Air Flow (MAF) sensor
• Vacuum leak in the intake system
• Faulty throttle body or throttle position sensor
Mass Air Flow (MAF) Sensor: A device that measures the amount of air entering the engine.
Bank 2: Refers to the side of the engine opposite Bank 1, typically on V-type engines.
• Use an OBD-II scanner to confirm the code.
• Inspect the MAF sensor and related wiring for damage.
• Check for vacuum leaks in the intake system.
• Clean or replace the MAF sensor.
• Repair any vacuum leaks.
• Replace the throttle body or throttle position sensor if faulty.
• OBD-II scanner
• Multimeter
• Vacuum leak detector
$100 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly clean or replace the air filter.
• Inspect and maintain the intake system.
• Perform routine checks on sensors and wiring.
Engine Performance
• Avoid driving the vehicle until it's repaired to prevent further damage.
• Regular maintenance can help prevent this issue.
Check with your vehicle manufacturer to see if the MAF sensor or related components are covered under warranty.
This code has been more common in vehicles with aging MAF sensors or those that have not had regular maintenance on the intake system.
Moderate – It's important to address this issue to prevent poor engine performance and fuel economy.
Driving with a malfunctioning MAF sensor can lead to increased emissions and potential safety issues.
• Engine at idle
• Vehicle in park or neutral
The Mass Air Flow sensor is typically located between the air filter and the throttle body in the intake system.
Q: Can I drive my car with a P1263 code?
A: It's not recommended to drive with this code as it can lead to poor engine performance and increased emissions.
Q: How do I know if my MAF sensor is bad?
A: Common signs include rough idle, poor fuel economy, and the Check Engine Light being on.
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Fitment Required · Vehicle-fitment part
Relevant for airflow, fuel-trim, and intake-metering faults after confirming the sensor is actually at fault.
Airflow and fuel-trim codes can involve the mass air flow sensor after proper diagnosis.
Verify the sensor design and fitment for your exact vehicle.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.